EP1754916A1 - Valve with piezoelectric element - Google Patents

Valve with piezoelectric element Download PDF

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Publication number
EP1754916A1
EP1754916A1 EP06013773A EP06013773A EP1754916A1 EP 1754916 A1 EP1754916 A1 EP 1754916A1 EP 06013773 A EP06013773 A EP 06013773A EP 06013773 A EP06013773 A EP 06013773A EP 1754916 A1 EP1754916 A1 EP 1754916A1
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EP
European Patent Office
Prior art keywords
valve
piezoelectric element
valve actuator
actuator
valve according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP06013773A
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German (de)
French (fr)
Other versions
EP1754916B1 (en
Inventor
Thomas Materne
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Wilo SE
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Wilo AG
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Publication of EP1754916A1 publication Critical patent/EP1754916A1/en
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Publication of EP1754916B1 publication Critical patent/EP1754916B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/004—Actuating devices; Operating means; Releasing devices actuated by piezoelectric means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/06—Check valves with guided rigid valve members with guided stems

Definitions

  • the invention relates to a valve with a valve actuator, which acts on a piezoelectric element.
  • valve actuator It is known to move the valve actuator through a piezoelectric element in the case of small valves. Furthermore, reflux valves are known which prevent backflow of the medium flowing through the valve.
  • the object of the invention is to provide a valve whose valve actuator in a predetermined position in a structurally simple manner is securely lockable and released again.
  • valve actuator by the piezoelectric element in at least one position lockable (lockable).
  • the piezoelectric element does not move the valve actuator itself, but only forms a stop or actuates a stop, comparatively large forces can be absorbed by the piezoelectric element or the part actuated by the piezoelectric element, which forces are required to determine the valve actuator.
  • the valve actuator can be locked by the piezoelectric element in the closed and / or in the open position.
  • the valve actuator is preferably operated by the valve-controlled medium or by the liquid, as is the case with a non-return valve.
  • a particularly simple construction with a long service life is given.
  • Such a hydraulic valve can be used particularly advantageously in pumps, in particular heating pumps, in heating water operation. This allows calibration of the pump in pump mode and a safe closed position in the off state.
  • the piezoelectric element holds the spring-loaded valve actuator against spring force.
  • the medium can open or close the valve actuator against spring force and in this position then the valve actuator can be held by the piezoelectric element or by a piezoelectric element moving part.
  • valve actuator can be acted upon by the medium, in particular by the liquid, which is controlled by the valve.
  • a mechanism in particular a transmission, is arranged on the piezoelectric element, by which an enlargement of the movement of the piezoelectric element can be generated.
  • valve actuator has a particular plate-shaped projection, behind which passes from the piezoelectric element movable lock (stop) for locking.
  • the projection and the valve actuator may be mounted on or on an axially movable valve rod.
  • the valve has a plate-shaped valve actuator 1, which rests in the closed state on an annular elastic valve seat 2.
  • a valve rod 3 is attached to the valve actuator 1 perpendicular to the valve plate and coaxially.
  • a plate-shaped projection 4 is also coaxially fixed at a distance from the valve actuator 1 and the valve stem 3 is mounted in a radial sliding bearing 5.
  • a spring element 6 is arranged in particular in the form of a helical compression spring which presses the valve actuator 1 against the valve seat 2.
  • a locking device 7 which in the closed position of the valve actuator on one side of the projection 4 (see Fig. 1) and in the open position of the valve actuator on the other side of the projection 4 (Fig ) is applied or the projection engages behind.
  • the valve actuator 1 can be locked both in the open position and in the closed position.
  • the valve actuator 1 by the medium flowing through the valve in particular a liquid is moved against the spring pressure in the open position, in order then to be locked in this position by the lock 7.
  • the lock 7 is itself a piezoelectric element, in particular in the case of very small valves, or the lock 7 is moved radially by a piezoelectric element.
  • a mechanism, in particular a gear can be arranged on the piezoelectric element, through which the movement of the piezoelectric element is increased.
  • a plurality can be arranged to lock the valve actuator in a position.
  • the reflux valve with piezoelectric element thus forms a backflow preventer, positioned on the back, which is kept open or closed by means of a piezoelectric element.
  • the piezoelectric element rests on an edge of the valve actuator of the non-return valve and thus prevents opening / closing of the valve. By energizing the piezoelectric element, it moves away from the valve actuator and thus allows opening / closing.
  • the valve is opened via the generated pump pressure. In the off state of the pump, the valve is closed by the lack of pressure difference due to the restoring force of the spring in the valve.
  • the valve When the pump is switched off, the valve is closed due to the restoring force of the spring in the valve.
  • the piezoelectric element prevents opening of the valve and thus also a circulation of the medium.
  • a pressure By switching on the pump, a pressure is generated, which is also present in front of the valve.
  • the system pressure continues to act behind the valve. If the piezo element is energized, it deforms and releases the Verrast réelle with the valve. Subsequently, the valve opens due to the pressure difference. After opening the valve, the energization of the piezoelectric element is released, with which it moves back into the valve, engages and prevents closing of the valve.
  • Switching off the pump causes the same pressures in front of and behind the valve.
  • An energization of the piezoelectric element causes a wander from the Valve, whereby the valve closes due to the restoring force of the spring. After the energization of the piezo has been released, it snaps back into the valve. Opening the valve is prevented.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Reciprocating Pumps (AREA)

Abstract

The valve has a piezoelectric element (7) which is operated to hold the valve piston (1) in the open or closed position.

Description

Die Erfindung betrifft ein Ventil mit einem Ventilstellglied, auf das ein Piezoelement einwirkt.The invention relates to a valve with a valve actuator, which acts on a piezoelectric element.

Es ist bekannt, bei kleinen Ventilen das Ventilstellglied durch ein Piezoelement zu bewegen. Ferner sind Rückflussventile bekannt, die einen Rückfluss des durch das Ventil strömenden Mediums verhindern.It is known to move the valve actuator through a piezoelectric element in the case of small valves. Furthermore, reflux valves are known which prevent backflow of the medium flowing through the valve.

Aufgabe der Erfindung ist es, ein Ventil zu schaffen, dessen Ventilstellglied in einer vorbestimmten Stellung auf konstruktiv einfache Weise sicher feststellbar und wieder lösbar ist.The object of the invention is to provide a valve whose valve actuator in a predetermined position in a structurally simple manner is securely lockable and released again.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass das Ventilstellglied durch das Piezoelement in mindestens einer Stellung feststellbar (arretierbar) ist.This object is achieved in that the valve actuator by the piezoelectric element in at least one position lockable (lockable).

Da das Piezoelement das Ventilstellglied selber nicht bewegt, sondern nur einen Anschlag bildet oder einen Anschlag betätigt, können durch das Piezoelement bzw. das vom Piezoelement betätigte Teil verhältnismäßig große Kräfte aufgenommen werden, die erforderlich sind, um das Ventilstellglied festzustellen. Hierbei kann das Ventilstellglied durch das Piezoelement in der geschlossenen und/oder in der geöffneten Stellung arretierbar sein.Since the piezoelectric element does not move the valve actuator itself, but only forms a stop or actuates a stop, comparatively large forces can be absorbed by the piezoelectric element or the part actuated by the piezoelectric element, which forces are required to determine the valve actuator. In this case, the valve actuator can be locked by the piezoelectric element in the closed and / or in the open position.

Das Ventilstellglied wird vorzugsweise durch das durch das Ventil gesteuerte Medium bzw. durch die Flüssigkeit betrieben, wie dies bei einem Rückflussverhinderer erfolgt. Hierbei ist eine besonders einfache Konstruktion bei hoher Lebensdauer gegeben.The valve actuator is preferably operated by the valve-controlled medium or by the liquid, as is the case with a non-return valve. Here, a particularly simple construction with a long service life is given.

Bei aus dem Stand der Technik bekannten Rückflussverhinderern muss die Strömung stets gegen eine Feder anarbeiten, wenn das Ventilstellglied durch eine Feder belastet ist. Bei der erfindungsgemäßen Lösung wird dagegen das Ventilstellglied durch das Piezoelement in offener Stellung gegen den Druck der Feder festgehalten, so dass damit auch kein Differenzdruck entsteht. Eine solche Konstruktion führt zu besonders preiswerten und extrem kleinen verriegelbaren Ventilen insbesondere Rückflussverhinderern.In known from the prior art backflow preventer the flow must always work against a spring when the valve actuator is loaded by a spring. In the solution according to the invention, however, the valve actuator is held by the piezoelectric element in the open position against the pressure of the spring, so that there is no differential pressure. Such a construction leads to particularly inexpensive and extremely small lockable valves, in particular non-return valves.

Besonders vorteilhaft ist ein solches hydraulisches Ventil bei Pumpen insbesondere Heizungspumpen im Heizungswasserbetrieb einsetzbar. Hierbei wird eine Kalibrierung der Pumpe im Pumpenbetrieb und eine sichere geschlossene Stellung im ausgeschalteten Zustand ermöglicht.Such a hydraulic valve can be used particularly advantageously in pumps, in particular heating pumps, in heating water operation. This allows calibration of the pump in pump mode and a safe closed position in the off state.

Vorzugsweise wird vorgeschlagen, dass das Piezoelement das federbeaufschlagte Ventilstellglied gegen Federkraft festhält. Hierdurch kann das Medium das Ventilstellglied gegen Federkraft öffnen oder schließen und in dieser Stellung kann dann das Ventilstellglied durch das Piezoelement oder durch ein Piezoelement bewegtes Teil festgehalten werden.Preferably, it is proposed that the piezoelectric element holds the spring-loaded valve actuator against spring force. As a result, the medium can open or close the valve actuator against spring force and in this position then the valve actuator can be held by the piezoelectric element or by a piezoelectric element moving part.

Somit kann das Ventilstellglied durch das Medium, insbesondere durch die Flüssigkeit, beaufschlagt sein, das/die vom Ventil gesteuert wird.Thus, the valve actuator can be acted upon by the medium, in particular by the liquid, which is controlled by the valve.

Vorzugsweise wird vorgeschlagen, dass am Piezoelement eine Mechanik insbesondere ein Getriebe angeordnet ist, durch die/das eine Vergrößerung der Bewegung des Piezoelementes erzeugbar ist.Preferably, it is proposed that a mechanism, in particular a transmission, is arranged on the piezoelectric element, by which an enlargement of the movement of the piezoelectric element can be generated.

Eine vorteilhafte Konstruktion ist gegeben, wenn das Ventilstellglied einen insbesondere tellerförmigen Vorsprung aufweist, hinter dem ein vom Piezoelement beweglicher Feststeller (Anschlag) zur Arretierung gelangt. Hierbei kann der Vorsprung und das Ventilstellglied auf oder an einem axial beweglichen Ventilstab befestigt sind.An advantageous construction is provided when the valve actuator has a particular plate-shaped projection, behind which passes from the piezoelectric element movable lock (stop) for locking. in this connection the projection and the valve actuator may be mounted on or on an axially movable valve rod.

Besonders vorteilhaft ist es, wenn es im Gehäuse einer Pumpe insbesondere im Einlass- und/oder Auslassstutzen angeordnet ist.It is particularly advantageous if it is arranged in the housing of a pump, in particular in the inlet and / or outlet connection.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung in axialen Schnitten dargestellt und wird im Folgenden näher beschrieben. Es zeigen

Fig. 1
das Rückflussverhindererventil in arretierter geschlossener Stellung,
Fig. 2
in frei beweglicher Stellung und
Fig. 3
in geöffneter arretierter Stellung.
An embodiment of the invention is shown in the drawing in axial sections and will be described in more detail below. Show it
Fig. 1
the backflow preventer valve in locked closed position,
Fig. 2
in a freely movable position and
Fig. 3
in open locked position.

Das Ventil weist ein tellerförmiges Ventilstellglied 1 auf, das im geschlossenen Zustand an einem ringförmigen elastischen Ventilsitz 2 anliegt. Auf der dem Ventilsitz 2 abgewandten Seite ist am Ventilstellglied 1 ein Ventilstab 3 senkrecht zum Ventilteller und koaxial befestigt. Am Ventilstab 3 ist ferner ein tellerförmiger Vorsprung 4 koaxial im Abstand zum Ventilstellglied 1 befestigt und der Ventilstab 3 ist in einem Radialgleitlager 5 gelagert.The valve has a plate-shaped valve actuator 1, which rests in the closed state on an annular elastic valve seat 2. On the side facing away from the valve seat 2, a valve rod 3 is attached to the valve actuator 1 perpendicular to the valve plate and coaxially. On the valve rod 3, a plate-shaped projection 4 is also coaxially fixed at a distance from the valve actuator 1 and the valve stem 3 is mounted in a radial sliding bearing 5.

Zwischen dem Gleitlager 5 und dem tellerförmigen Vorsprung 4 ist ein Federelement 6 insbesondere in Form einer Schraubendruckfeder angeordnet, die das Ventilstellglied 1 gegen den Ventilsitz 2 drückt.Between the slide bearing 5 and the plate-shaped projection 4, a spring element 6 is arranged in particular in the form of a helical compression spring which presses the valve actuator 1 against the valve seat 2.

Seitlich neben dem tellerförmigen Vorsprung 4 ist ein Feststeller 7 radial beweglich angeordnet, der in geschlossener Stellung des Ventilstellglieds auf einer Seite des Vorsprungs 4 (s. Fig. 1) und in geöffneter Stellung des Ventilstellglieds auf der anderen Seite des Vorsprungs 4 (Fig. 3) anliegt bzw. den Vorsprung hintergreift. Damit kann das Ventilstellglied 1 sowohl in geöffneter Stellung als auch in geschlossener Stellung arretiert werden. Hierbei wird das Ventilstellglied 1 durch das das Ventil durchströmende Medium insbesondere eine Flüssigkeit gegen den Federdruck in die geöffnete Stellung bewegt, um dann in dieser Stellung vom Feststeller 7 arretiert zu werden.On the side next to the plate-shaped projection 4 there is arranged in a radially movable manner a locking device 7, which in the closed position of the valve actuator on one side of the projection 4 (see Fig. 1) and in the open position of the valve actuator on the other side of the projection 4 (Fig ) is applied or the projection engages behind. Thus, the valve actuator 1 can be locked both in the open position and in the closed position. In this case, the valve actuator 1 by the medium flowing through the valve in particular a liquid is moved against the spring pressure in the open position, in order then to be locked in this position by the lock 7.

Der Feststeller 7 ist insbesondere bei sehr kleinen Ventilen direkt selber ein Piezoelement oder aber der Feststeller 7 wird von einem Piezoelement radial bewegt. Alternativ kann am Piezoelement eine Mechanik insbesondere ein Getriebe angeordnet sein, durch das die Bewegung des Piezoelementes vergrößert wird. Auch können statt einem Piezoelement mehrere angeordnet werden, um das Ventilstellglied in einer Stellung zu arretieren.The lock 7 is itself a piezoelectric element, in particular in the case of very small valves, or the lock 7 is moved radially by a piezoelectric element. Alternatively, a mechanism, in particular a gear can be arranged on the piezoelectric element, through which the movement of the piezoelectric element is increased. Also, instead of a piezoelectric element a plurality can be arranged to lock the valve actuator in a position.

Das Rückflussventil mit Piezoelement bildet somit einen Rückflussverhinderer, positioniert auf der Rückseite, der mittels eines Piezoelementes offen bzw. geschlossen gehalten wird.The reflux valve with piezoelectric element thus forms a backflow preventer, positioned on the back, which is kept open or closed by means of a piezoelectric element.

Nicht bestromt liegt das Piezoelement auf einer Kante des Ventilstellglieds des Rückflussverhinderers an und verhindert somit ein Öffnen/Schließen des Ventils. Durch Bestromung des Piezoelementes bewegt es sich fort von dem Ventilstellglied und ermöglicht damit ein Öffnen/Schließen. Geöffnet wird das Ventil über den erzeugten Pumpendruck. Im ausgeschalteten Zustand der Pumpe ist das Ventil durch die fehlende Druckdifferenz aufgrund der Rückstellkraft der Feder im Ventil geschlossen.Not energized, the piezoelectric element rests on an edge of the valve actuator of the non-return valve and thus prevents opening / closing of the valve. By energizing the piezoelectric element, it moves away from the valve actuator and thus allows opening / closing. The valve is opened via the generated pump pressure. In the off state of the pump, the valve is closed by the lack of pressure difference due to the restoring force of the spring in the valve.

Im ausgeschalteten Zustand der Pumpe ist das Ventil aufgrund der Rückstellkraft der Feder im Ventil geschlossen. Das Piezoelement verhindert ein Öffnen des Ventils und damit auch eine Zirkulation des Mediums. Durch das Einschalten der Pumpe wird ein Druck erzeugt, der auch vor dem Ventil ansteht. Hinter dem Ventil wirkt weiterhin der Systemdruck. Wird das Piezoelement bestromt, verformt es sich und löst die Verrasterung mit dem Ventil. Anschließend öffnet sich das Ventil aufgrund der Druckdifferenz. Nach dem Öffnen des Ventils, wird die Bestromung des Piezoelementes aufgehoben, womit es sich wieder in das Ventil bewegt, einrastet und ein Schließen des Ventils verhindert.When the pump is switched off, the valve is closed due to the restoring force of the spring in the valve. The piezoelectric element prevents opening of the valve and thus also a circulation of the medium. By switching on the pump, a pressure is generated, which is also present in front of the valve. The system pressure continues to act behind the valve. If the piezo element is energized, it deforms and releases the Verrasterung with the valve. Subsequently, the valve opens due to the pressure difference. After opening the valve, the energization of the piezoelectric element is released, with which it moves back into the valve, engages and prevents closing of the valve.

Durch das Ausschalten der Pumpe wirken vor und hinter dem Ventil die gleichen Drücke. Eine Bestromung des Piezoelementes bewirkt ein Wandern aus dem Ventil, wodurch sich das Ventil aufgrund der Rückstellkraft der Feder schließt. Nachdem die Bestromung des Piezos aufgehoben wurde, rastet es wieder im Ventil ein. Ein Öffnen des Ventils wird verhindert.Switching off the pump causes the same pressures in front of and behind the valve. An energization of the piezoelectric element causes a wander from the Valve, whereby the valve closes due to the restoring force of the spring. After the energization of the piezo has been released, it snaps back into the valve. Opening the valve is prevented.

Da ein Piezoelement sich nur um einen sehr kleinen Betrag verformt, ist es ggf. erforderlich, ein Element zur Wegvergrößerung an das Piezoelement anzubringen. Dadurch ist eine größere Auflage der Piezoelementeinheit an dem Ventilstellglied gegeben.Since a piezoelectric element deforms only by a very small amount, it may be necessary to attach an element for increasing the travel distance to the piezoelectric element. As a result, a larger edition of the piezo element unit is given to the valve actuator.

Claims (9)

Ventil mit einem Ventilstellglied (1), auf das ein Piezoelement (7) einwirkt, dadurch gekennzeichnet, dass das Ventilstellglied (1) durch das Piezoelement (7) in mindestens einer Stellung feststellbar (arretierbar) ist.Valve with a valve actuator (1), on which a piezoelectric element (7) acts, characterized in that the valve actuator (1) by the piezoelectric element (7) in at least one position lockable (lockable). Ventil nach Anspruch 1, dadurch gekennzeichnet, dass das Ventilstellglied (1) durch das Piezoelement (7) in der geschlossenen und/oder in der geöffneten Stellung arretierbar ist.Valve according to claim 1, characterized in that the valve actuator (1) by the piezoelectric element (7) in the closed and / or in the open position can be locked. Ventil nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Piezoelement (7) das federbeaufschlagte Ventilstellglied (1) gegen Federkraft (6) festhält.Valve according to claim 1 or 2, characterized in that the piezoelectric element (7) holds the spring-loaded valve actuator (1) against spring force (6). Ventil nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass das Ventilstellglied (1) durch das Medium insbesondere die Flüssigkeit beaufschlagt ist, das/die vom Ventil gesteuert wird.Valve according to one of the preceding claims, characterized in that the valve actuator (1) is acted upon by the medium in particular the liquid which is controlled by the valve. Ventil nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass am Piezoelement (7) eine Mechanik insbesondere ein Getriebe angeordnet ist, durch die/das eine Vergrößerung der Bewegung des Piezoelementes (7) erzeugbar ist.Valve according to one of the preceding claims, characterized in that on the piezoelectric element (7) a mechanism, in particular a transmission is arranged, through which / an increase in the movement of the piezoelectric element (7) can be generated. Ventil nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass es ein Rückflussverhinderer ist.Valve according to one of the preceding claims, characterized in that it is a backflow preventer. Ventil nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass das Ventilstellglied (1) einen insbesondere tellerförmigen Vorsprung (4) aufweist, hinter dem ein vom Piezoelement beweglicher Feststeller (Anschlag) (7) zur Arretierung gelangt.Valve according to one of the preceding claims, characterized in that the valve actuator (1) has a particular plate-shaped projection (4), behind which passes from the piezoelectric element movable lock (stop) (7) for locking. Ventil nach Anspruch 7, dadurch gekennzeichnet, dass der Vorsprung (4) und das Ventilstellglied (1) auf oder an einem axial beweglichen Ventilstab (3) befestigt sind.Valve according to claim 7, characterized in that the projection (4) and the valve actuator (1) are mounted on or on an axially movable valve rod (3). Ventil nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass es im Gehäuse einer Pumpe insbesondere im Einlass und/oder Auslassstutzen angeordnet ist.Valve according to one of the preceding claims, characterized in that it is arranged in the housing of a pump in particular in the inlet and / or outlet port.
EP06013773A 2005-08-16 2006-07-04 Valve with piezoelectric element Not-in-force EP1754916B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005038426A DE102005038426A1 (en) 2005-08-16 2005-08-16 Valve with piezo element

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EP1754916A1 true EP1754916A1 (en) 2007-02-21
EP1754916B1 EP1754916B1 (en) 2010-09-22

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AT (1) ATE482355T1 (en)
DE (2) DE102005038426A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102018200304A1 (en) * 2018-01-10 2019-07-11 Volkswagen Aktiengesellschaft Check valve with shut-off function

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US4492891A (en) * 1982-04-01 1985-01-08 U.S. Philips Corporation Piezoelectric actuator arrangement with adjustment for wear
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GB2376795A (en) * 2001-06-20 2002-12-24 1 Ltd Electro-mechanical control using an electro-active device
DE10203260A1 (en) * 2002-01-29 2003-07-31 Heinz Leiber Clamping system has piezo electric actuator operating two opposing sliding parts closing on shaft

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Publication number Priority date Publication date Assignee Title
GB808577A (en) * 1956-03-27 1959-02-04 Rotol Ltd Improvements in or relating to hydraulic safety valves
US4494727A (en) 1980-10-23 1985-01-22 Robert Bosch Gmbh Electrically controllable valve
US4492891A (en) * 1982-04-01 1985-01-08 U.S. Philips Corporation Piezoelectric actuator arrangement with adjustment for wear
DE3608494A1 (en) * 1986-03-14 1987-09-17 Bosch Gmbh Robert ELECTRICALLY CONTROLLABLE ACTUATOR
DE19649225A1 (en) 1996-11-27 1998-05-28 Nass Magnet Gmbh Valve
EP0903522A2 (en) * 1997-08-19 1999-03-24 LANDIS & STAEFA, INC. Actuator having electrostrictive braking element
DE10120709A1 (en) * 2001-04-27 2002-10-31 Bosch Gmbh Robert Liquids fine control valve esp. for common rail fuel injection system, has piezo-actuator and compensating element arranged in common space
GB2376795A (en) * 2001-06-20 2002-12-24 1 Ltd Electro-mechanical control using an electro-active device
DE10203260A1 (en) * 2002-01-29 2003-07-31 Heinz Leiber Clamping system has piezo electric actuator operating two opposing sliding parts closing on shaft

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Publication number Priority date Publication date Assignee Title
WO2021094102A1 (en) * 2019-11-13 2021-05-20 Robert Bosch Gmbh Fuel cell system and method for operating a fuel cell system

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DE102005038426A1 (en) 2007-02-22
ATE482355T1 (en) 2010-10-15
EP1754916B1 (en) 2010-09-22
DE502006007914D1 (en) 2010-11-04

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